| Value |
Category |
| -97 |
Don't know |
| 1 |
9-11 |
| 2 |
12-14 |
| 3 |
15-17 |
| 4 |
18-20 |
| a |
Not applicable |
| b |
Don't know |
| c |
Refused to respond |
Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.